As a source of energy on earth, there is nothing like the sun: in a mere one thousandth of one second (.001), the sun emits enough energy to fulfill our planet’s (3)_______ needs for the next 5,000 years.

According to paragraph 2, what is the matter that the author want to emphasise?

In the future, maybe all cars that run on petrol will be replaced by solar cars, which have been around for a while, but with recent (1)__________ in solar car design and the measurement of photovoltaic cells becoming smaller, the dream of a truly efficient solar car is more reality than fantasy.

The word “they” in paragraph 2 refers to _______.

According to paragraph 1, which statement is correct about the current situation for smart cities?

Being stuck in traffic jams could become a thing of the past, as driverless cars will be able to drive at speed (4) ___________ to each other.

Which of the following is true, according to the passage?

Many cars can already park themselves on the roadside, brake automatically when the car needs to slow down, and warn the driver (2) __________ they are slipping out of the right lane, so going driverless is just the next step towards automated driving.

The phrase “hide our heads in the sand” in the passage probably means ______.

According to the passage, in the future children ______.

Which is NOT one of the writer’s predictions?

From the passage, we can infer that ______.

The word “obsolete” in the first paragraph is closet in meaning to ______.